Gaya APA

Butterfield, M., Woodward, J. (2018). Colours of the World Blue Planet Life In Our Oceans And Rivers . Cheltenham: Liontree Publishing.

Gaya MLA

Butterfield, Moira., Woodward, Jonathan. "Colours of the World Blue Planet Life In Our Oceans And Rivers". Cheltenham: Liontree Publishing, 2018. Text.